Method and apparatus for efficient digital time delay...

Details Method and apparatus for efficient digital time delay... Method and apparatus for efficient digital time delay...

H - Electricity

03

K

354/47, 354/67

H03K 5/159 (2006.01)

Patent

CA 1253254

METHOD AND APPARATUS FOR EFFICIENT DIGITAL TIME DELAY COMPENSATION IN QMF SUBBAND SIGNAL PROCESSING. ABSTRACT OF THE DISCLOSURE In a subband coder/decoder using a non-symmetrical QMF filter tree, the necessary time delay compensation in the various subband channels is effected subsequent to a digital bandwidth compression encoding step on the transmitter side. On the receiver side, similar time compensation may be provided in the subband channels prior to a digital bandwidth expansion decoding step. By implementing the necessary digital time delay compensation at a point in the system where the signals are bandwidth compressed to a maximum degree (i.e. using a minimum number of bits per second to transmit given information), digital memory requirements for implementing the digital time delay compensation are minimized.

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